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 string fileData = "", compress = "";  private void btnPath_Click(object sender, EventArgs e)  {      OpenFileDialog ofd = new OpenFileDialog();      if (ofd.ShowDialog() == DialogResult.OK)      {          textBox1.Text = ofd.FileName;          FileInfo fi = new FileInfo(ofd.FileName);          GetSize(fi.Length, lbFile);          fileData = File.ReadAllText(ofd.FileName);      }  }
  private void btnCompress_Click(object sender, EventArgs e)  {      compress = Compress(fileData);      GetSize(Encoding.Default.GetBytes(compress).Length, lbCompress);      MessageBox.Show("成功");  }
  private void btnDecompress_Click(object sender, EventArgs e)  {      richTextBox1.Text = Decompress(compress);      MessageBox.Show("成功");

  }
  //壓縮字符串  public string Compress(string value)  {      try      {          string data = "";          byte[] byteArray = Encoding.Default.GetBytes(value);          using (MemoryStream ms = new MemoryStream())          {              using (GZipStream sw = new GZipStream(ms, CompressionMode.Compress))              {                  sw.Write(byteArray, 0, byteArray.Length);                  GetSize(ms.Length, lbCompress);              }
              data = Convert.ToBase64String(ms.ToArray());          }          return data;
      }      catch (Exception ex)      {          throw ex;      }  }
  //解壓縮字符串  public string Decompress(string value)  {      try      {          string data = "";          byte[] bytes = Convert.fromBase64String(value);          using (MemoryStream msReader = new MemoryStream())          {              using (MemoryStream ms = new MemoryStream(bytes))              {                  using (GZipStream zip = new GZipStream(ms, CompressionMode.Decompress))                  {                      byte[] buffer = new byte[1024];                      int readLen = 0;                      while ((readLen = zip.Read(buffer, 0, buffer.Length)) > 0)                      {                          msReader.Write(buffer, 0, readLen);                      }
                  }              }              data = Encoding.Default.GetString(msReader.ToArray());          }          return data;      }      catch (Exception ex)      {          throw ex;      }  }
  //獲取大小  private void GetSize(long size, Control control)  {      string sizeStr = "";      if (size < 1024)          sizeStr = size.ToString("F2") + " Byte";      else if (size >= 1024 && size < 1048576)          sizeStr = (size / 1024).ToString("F2") + " K";      else if (size >= 1048576 && size < 1073741824)          sizeStr = (size / 1024 / 1024).ToString("F2") + " M";      else if (size >= 1073741824)          sizeStr = (size / 1024 / 1024 / 1024).ToString("F2") + " G";      control.Text = sizeStr;  }